JP2778565B2 - Radio selective call receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio paging receiver, and more particularly to a radio paging receiver that automatically selects one of a plurality of signal formats and receives a paging signal.

[0002]

2. Description of the Related Art In order to increase the bit rate as the number of subscribers increases, not only the bit rate is increased, but also a plurality of types of signal transmission formats have been proposed. There are many signal formats.

[0003] However, the conventional radio selective calling signal receiver supports only a single signal system.
In addition, in operation, the reception operation is performed only at a predetermined bit rate.

[0004]

In the above-mentioned conventional radio selective calling signal receiver, only a single signal format is supported, and operation is performed only at a single bit rate. It cannot be used in an area that adopts a different signal format or bit rate, and cannot receive a signal that adopts a different signal format or bit rate even in a good reception situation.

[0005] Japanese Patent Application Laid-Open No. 1-93221 discloses a technique for switching a reception frequency, a signal speed, and a signal system by manual operation, and the electric field strength, bit error rate, and synchronization state of a reception wave that is constantly monitored. A technology has been disclosed in which when this is recognized, the frequency is sequentially switched to search for a corresponding channel and automatically enter a reception state on that channel.

However, in the above technique, since a single signal format or bit rate is set for each frequency, if a different signal format or bit rate is adopted in the same service area, the signal cannot be received. Even if there is a signal whose reception status is better than that of the signal, the signal cannot be received.

[0007] Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a radio which can receive a signal having a good reception condition among a plurality of signals adopting different signal formats and bit rates in the same area. An object of the present invention is to provide a selective calling signal receiver.

[0008]

SUMMARY OF THE INVENTION A radio selective calling signal receiver according to the present invention receives at least a radio signal modulated by a selective calling signal and demodulates the signal, and analyzes the signal demodulated by the receiving means. Means for storing a selective calling signal addressed to the own device and performing a battery saving operation in accordance with the state of the signal, the receiving condition of the wireless signal received by the receiving means. determining means for determining quality, and determining means for determining the bit rate of the signal demodulated by the reception condition is judged to be good and the reception unit in the determination unit, is employed in the same area
Receiving control means for controlling the operation of receiving the selective calling signal in accordance with a signal format suitable for the bit rate determined by the determining means among the plurality of signal formats .

Another radio selective call receiver according to the present invention comprises:
In addition to the above configuration, storage means for storing information of a plurality of different signal formats and the bit rates in association with each other, and a signal adapted to the bit rate determined by the determination means with reference to the storage means said the format
Means for extracting from a plurality of signal formats .

Another radio selective call receiver according to the present invention comprises:
In addition to the above configuration, comprising a detection means for detecting a synchronizing signal of the demodulated signal by the reception means, in said determination means
A signal format that matches the determined bit rate
The reception control means controls the operation of receiving the selective calling signal in accordance with a signal format suitable for the synchronization signal detected by the detection means when there are a plurality of such signals.

[0011] Still another radio selective calling receiver according to the present invention, in addition to the above-mentioned configuration, storage means for storing the information of the signal format and the combination of the bit rate and the synchronization signal in association with each other; A signal matching the bit rate determined by the determination means with reference to the storage means
Means for extracting a signal format suitable for the synchronization signal detected by the detection means when there are a plurality of formats .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of the present invention will be described below.

The reception condition of the received radio signal is determined to be good by the electric field strength detector, and the bit rate of the signal demodulated by the receiver is determined by a bit rate determiner, and the bit rate is determined according to the signal format conforming to the bit rate. The receiving control section controls the receiving operation of the selective calling signal.

[0014] This makes it possible to automatically select a plurality of signal formats and perform reception, thereby enabling automatic roaming between areas adopting different signal formats and signals having good reception conditions within the same area. It becomes possible to select and receive. Therefore, it is possible to receive a signal having a good reception condition among a plurality of signals adopting different signal formats and bit rates in the same area.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, the radio selective calling receiver according to one embodiment of the present invention includes an antenna 1, a receiving unit 2, a control unit 3, a notification unit 4, and a display unit 5.

The receiving unit 2 includes an electric field intensity detecting unit 2a for detecting the electric field intensity of the radio signal received by the antenna 1, and the control unit 3 includes a bit rate determining unit 31;
SC code (codeword synchronization code) detector 32, i
It comprises a D (selection call signal) detector 33, a message storage unit 34, and a reception control unit (information processing unit) 35. The reception control unit 35 has a bit rate table 35a for storing a preset bit rate, signal system, and reception conditions.

The electric field intensity of the radio signal received by the antenna 1 is detected by the electric field intensity detecting section 2a of the receiving section 2, and the radio signal having good receiving conditions is demodulated by the receiving section 2 and transmitted to the control section 3. You.

The control section 3 determines the signal format of the signal demodulated by the receiving section 2, detects a selective call signal addressed to itself, and takes in a message accompanying the selective call.

That is, in the control unit 3, the signal demodulated by the receiving unit 2 is input to a bit rate determiner 31, an SC code detector 32, an iD detector 33, and a message storage 34, respectively.

The bit rate determiner 31 determines the bit rate of the signal demodulated by the receiver 2, and the SC code detector 32 detects the SC code of the signal demodulated by the receiver 2, and outputs an iD detector At 33, the iD of the signal demodulated by the receiver 2 is detected, and at the message storage 34, the message in the signal demodulated by the receiver 2 is stored.

The bit rate determination value 101 determined by the bit rate determiner 31 is output to the reception controller 35.
The reception control unit 35 refers to the bit rate determination value 101 and the bit rate table 35a, and determines the bit rate determination value 1
01 while controlling reception according to a signal format conforming to the bit rate determination value 101
The C code is set in the SC code determiner 32 in the control operation 106, and the received iD having a signal format conforming to the bit rate determination value 101 is set in the iD detector 33 in the operation control 107.

The SC code judging unit 32 detects the SC code of the signal demodulated in the receiving unit 2 based on the set SC code, and the iD detector 33 detects the SC code in the receiving unit 2 based on the set received iD. The iD of the demodulated signal is detected.

The SC code detector 32 simultaneously has at least two
The reception control unit 35 has a function of detecting one or more SC codes, and when there are a plurality of signal formats that match the bit rate determination value 101 determined by the bit rate determination unit 31, the reception control unit 35 detects the SC format by the SC code detector 32. The subsequent reception control is performed in a signal format compatible with the SC code.

When the control unit 3 detects the selective call addressed to itself by the above-described processing, it notifies the notification unit 4 of the fact and notifies the message storage unit 34 by the operation control 108.
Is notified to the display unit 5 as a message accompanying the selective call. Notification unit 4
Informs the receiver carrier of the selective call addressed to him / her by sound or light, and the display unit 5 displays a message accompanying the selective call.

FIG. 2 is a block diagram showing the configuration of the bit rate determiner 31 of FIG. In the figure, a bit rate determination unit 31 includes a noise canceller 31a, a data change point interval measurement unit 31b, and a data change point interval comparison control unit 31.
and a test bit rate storage unit 31d.

In the bit rate determiner 31, after the noise demodulated by the noise canceller 31a is applied to the signal demodulated by the receiver 2, the data change point interval measuring device 31b is used.
The data change point interval comparison control unit 31c compares the measurement result of the data change point interval measurement unit 31b with the test bit rate interval stored in the test bit rate storage unit 31d.

If the comparison result is within the error range, the data change point interval comparison control section 31c again checks the data change point interval newly measured by the data change point interval measuring device 31b and the test bit rate of the test bit rate storage section 31d. A comparison with the rate interval is performed. If the comparison result is within the same error range for a predetermined number of consecutive times, the bit rate of the signal is determined as the test bit rate, and the bit rate determination value 101 is set to the reception control unit. 35. The operation control unit 105 sets the test bit rate interval from the reception control unit 35 in the test bit rate storage unit 31d.

FIG. 3 is a block diagram showing the configuration of the SC code detector 32 shown in FIG. In the figure, SC code detector 3
Reference numeral 2 denotes a 32-stage shift register 32a and a pattern match circuit 32b.

In the SC code detector 32, every time one bit of the signal demodulated by the receiving unit 2 is received, the signal is shifted into the shift register 32a, and each time one bit is received, the signal is shifted into the shift register 32a. The pattern matching circuit 32b performs bit number pattern matching of the SC code length on the data.

The pattern match circuit 32b operates in parallel for each SC code, and outputs the detected SC type 102 to the reception control unit 35. Incidentally, the operation control 10 is provided in the pattern match circuit 32b.
6 sets the SC code from the reception control unit 35.

FIG. 4 shows the bit rate table 35a of FIG.
FIG. 3 is a diagram showing an example of the configuration of FIG. In the figure, a bit rate table 35a stores a bit rate value, a signaling method, and a reception condition in association with each other.

For example, the bit rate value “512 bps”
, The signal system “POCSAG”, the reception conditions “common SC: 7CD215D8”, and “individual iD1:
0320004 "," Individual iD2: 032002 "
Are stored in association with each other.

For the bit rate value "1200 bps", the signal system "POCSAG" and the reception condition "common"
SC: 7CD215D8 "," Individual iD1: 0320
000 "and" individual iD2: 0320008 "are stored in association with each other.

For the bit rate value "1200 bps", the signal system "signal system 1" and the reception condition "common S"
C: 1388067C "," individual iD: 555555
55 ”are stored in association with each other.

For the bit rate value “3250 bps”, the signal system “signal system 3” and the reception condition “common S
C: 8A20A0A8 "," individual iD: 876543
21 "are stored in association with each other.

FIG. 5 is a flowchart showing an algorithm for automatically determining a signal format according to an embodiment of the present invention. An algorithm for automatically determining a signal format according to an embodiment of the present invention will be described with reference to FIGS.

When a radio signal is received by the antenna 1, the reception control unit 35 puts the reception unit 2 into an operating state for a while, and receives a signal for which reception conditions are determined to be good from the electric field intensity detected by the electric field intensity detection unit 2a. Demodulate by receiving unit 2 (receiving condition judgment)
(Step S1 in FIG. 5).

The reception controller 35 detects the bit rate of the signal demodulated by the receiver 2 by the bit rate determiner 31 (bit rate search operation) (step S2 in FIG. 5).
When the value shown in the bit rate table 35a is detected by the bit rate determiner 31 during the bit rate search operation (step S4 in FIG. 5), the reception control unit 35 detects the loss of synchronization of the reception in the compatible signal format. (Step S7 in FIG. 5).

When a predetermined bit rate is not detected in the bit rate search operation, the bit rate search operation is performed again (step S2 in FIG. 5) after a pause period (step S3 in FIG. 5).

If the bit rate determination value 101 determined during the bit rate search operation is a bit rate that conforms to a plurality of signal formats, the reception control unit 35 controls the SC code detector 32 in the operation control 106 by the number of signal formats. An SC code is set and an SC search operation is performed (see FIG. 5).
Steps S5 and S6).

When an SC code corresponding to any of the set SC codes is searched during the SC search operation, reception according to the signal format conforming to the SC code is performed until the loss of synchronization is detected (FIG. 5). Step S
7).

If no SC code corresponding to any of the set SC codes is searched during the SC search operation, the bit rate search operation is performed again after a pause period (step S3 in FIG. 5) (step S3 in FIG. 5). S2).

As described above, the reception condition of the received radio signal is determined to be good by the electric field strength detector 2a, and the bit rate of the signal demodulated by the receiver 2 is determined by the bit rate determiner 31, and the bit rate is determined. The reception control unit 35 controls the reception operation of the selective calling signal according to the signal format conforming to the above, so that a plurality of signal formats can be automatically selected and received.

As a result, it becomes possible to perform automatic roaming between areas adopting different signal formats, and to select and receive signals having good reception conditions within the same area. Therefore, it is possible to receive a signal having a good reception condition among a plurality of signals adopting different signal formats and bit rates in the same area.

[0045]

As described above, according to the present invention, at least a radio signal modulated by a selective call signal is received and demodulated, the demodulated signal is analyzed, and a selective call signal addressed to the own apparatus is stored. And performing a battery saving operation in accordance with the state of the signal, the receiving condition of the received wireless signal is determined to be good, the bit rate of the demodulated signal is determined, and the bit rate is adapted. By controlling the receiving operation of the selective calling signal according to the signal format to be performed, it is possible to receive a signal having a good reception condition among a plurality of signals adopting different signal formats and bit rates in the same area. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a bit rate determiner of FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of an SC code detector of FIG. 1;

FIG. 4 is a diagram illustrating a configuration example of a bit rate table in FIG. 1;

FIG. 5 is a flowchart illustrating an algorithm for automatically determining a signal format according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 reception unit 3 control unit 4 notification unit 5 display unit 31 bit rate determiner 32 SC code detector 33 iD detector 34 message storage 35 reception control unit 35a bit rate table

Claims (4)

(57) [Claims] 1. A receiving means for receiving and demodulating at least a radio signal modulated by a selective calling signal, analyzing a signal demodulated by the receiving means, storing a selective calling signal addressed to the own apparatus, and storing the signal. Means for performing a battery saving operation in accordance with the situation of the radio selective call receiver,
Judgment means for judging whether the reception condition of the radio signal received by the reception means is good, and judgment means for judging the bit rate of the signal demodulated by the reception means is judged that the reception condition is good by the judgment means, and Used in the same area
A radio selective call receiver, comprising: reception control means for controlling an operation of receiving the selective call signal in accordance with a signal format suitable for the bit rate determined by the determination means among a plurality of signal formats . 2. A storage means for storing information of a plurality of different signal formats and the bit rate in association with each other, and a signal format conforming to the bit rate determined by the determination means with reference to the storage means. The plurality
Means for extracting from a signal format . 3. A detecting means for detecting a synchronizing signal of the signal demodulated by said receiving means, wherein said detecting means determines the synchronization signal.
There are multiple signal formats that match the bit rate
Claim 1 or claim 2, wherein said reception control means in response to matching the signal format on the detected synchronization signal detecting means is characterized in that so as to control the receiving operation of the selective call signal when Wireless selective call receiver. 4. A storage means for storing in association with each combination of the information of the signal format bit rate and the synchronization signal, adapted to the bit rate determined in said determination means by referring to said storage means Signal format
4. A radio selective call receiver according to claim 3, further comprising means for extracting a signal format suitable for the synchronization signal detected by said detection means when there are a plurality of radio signals.